The HTML5 specification includes a huge array of new semantic elements which would enhance some of the parts of a web page, including the header, footer, and so on. The div tag was used to create the semantic elements but there were not specific rules or semantic meaning to it. It was difficult for software to determine what a specific element was doing. HTML5 would resolve such issues, making it easier to parse the semantic structure.
The Web was not built previously with audio or video content in mind and the provision of this was largely provided by Flash Video (.flv) file format.
There are many decisions related to HTML5 which are pending and its accessibility is required in a variety of formats and browsers. Web developers have traditionally used cookies for storing information about a Web page in the local machine. The only hitch is not more than 20 cookies per Web server can be saved. HTML5 though provides a solution with the help of local storage APIs which allows developers for information storage. The specification also includes same-origin restrictions.
HTML5 provides support for all types of offline applications where the browser downloads the files and the user can uses the application offline.
Support for such form fields is quite limited today. Safari and Opera browser provide some features to run these controls including some new widgets.
HTML5 also supports two new features for form fields: autofocus and the placeholder attribute. The autofocus tells the browser which field to focus on without external role while the placeholder attribute allows the developer to define text that will appear in an empty text control.
Geolocation, Drag and Drop, Cross-document messaging are some of the new features introduced in HTML5 development.